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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0daca352d1d809ee6a823090988ff37654af276836ce9fa7b676f1de0bfa2204' 
  AND token = 'zuJJFF/ck3Ij/J9qTd68EGFvjAP5w9T06BxC1c2ZhGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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