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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98a859ba430e6d5559ca0b4d2d20bf5104ba5f4729639a392dca96cdd7fd1457' 
  AND token = 'ZnGfq88N5KEEH8ZkWOtP/hvcPjh3okKiw5ws5eRWMfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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