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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da2779b68d68c1d591aa1c1135a52aac30bf2ea3356e1b5be19a1a991769076e' 
  AND token = 'xsAWzRqMF1a1/Yp6Md/pNJEPApHMragAI1l1BKjoUGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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