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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dbcd10259d16eb2a0b2de4b926ae0b5947217488164626278c677b701709417' 
  AND token = 'Oos7WGlLu2sWG9VRwM5UQadcRfuEFQvVPRfKZz6FLtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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