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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd19d3debe0983323306909c4a47dfa56966d841df7207a1500de9f80d5877dc1' 
  AND token = 'uBOId2j5F9JzFUcNUS3iPgfICPG4KUDHS0xjZzsxy1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}