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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b7a2fdd7df3ae33b45faf6b89c7f4c6711bc4541c96fffdd75ba1231b28fca6' 
  AND token = 'K9oba03CLIari8ARZq7GE8zs1404v9iu4cT19F01ZAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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