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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '246cee07b3cadad4029f9c0142b918c0b97c7ee86accc78040bbd43063041239' 
  AND token = 'CIDCCyYVY4DCyFKcZuv0iiJ8e/QNyo/JmskayBbrXPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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