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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0da8f2e824e58f926181a5b4ae775ba15d9b9ef055f403cbd1f8898ddec177cb' 
  AND token = '7OHMLG7Wi3GHmHw/4BJaGr9xItjhfBfzeobJ8n0/Wek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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