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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a458e4ba57f753ee17cbb97b3d539c1e637644b2f142fe436024b8fe88c209b' 
  AND token = '4Zh3PdQaF8MCmEDmTR9Jsj3MbC4XkkQxRQ2goFX6VdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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