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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c4a911bee2e86bdf49cd6acaa83ae857a08add1cd8f87c0fefa697a5a94b571' 
  AND token = 'djp+KqkmTo+KZSY511yTpLmLNU2k1rgYeodo0wb3wCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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