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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac1d4de7d0691a181c773db4a2c69a7b051caf5a0b4d61682c440def515eb353' 
  AND token = 'H1TxKyRZRFj4u1cevi24PGwWR/N4ZfA1VCnz9NavpS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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