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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32cb3e68c01175c80121640f4c00c4cb2328c7f4dc3a694a1a4ff9650b04c36f' 
  AND token = 'kbU8yr5vUKuMMgvDCQMgH2Ulplz2CjO1HCE3cKdJW8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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