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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e12174ba5cd4df566fdbfd968e2c681e864cf5db98842a317e3debf51ecfc52' 
  AND token = 'jcL6iBLdAO+EI/a8GpkNog1d9bAEeBYcvtpwq0QgB/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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