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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '414e2ac0aec666e28ac8fccccbc4a48fb84cbdc314e2679de672ef30201eb8e0' 
  AND token = 'tTIRYHZ2YchlktY5gbX0h2ZbEU2l+JkskxEdbNOMTbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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