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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '881a3edf8348d2bcbdf3855c761552a405acf97dab1f93c60b5689a738a26416' 
  AND token = 't1+Vz7i4bZ0If5pJz7ecMlYTCuwL1z51rM19yoJRB7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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