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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27530d231d993a707a42f5031b6a4c6a216d80bf39a8e13dbf51669216480461' 
  AND token = 'lH91vggcF9Nb3nw8fusSzRRBm9/GBrFvxPebj3R0G/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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