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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0aa924bb7d932ed68b6495cf1283e07c4825435053e4ba0ec8730bb67efd964' 
  AND token = 'faPZ81KIC1Koqgcea8DEsLS+Kjo14SI26x+uIEO+4RA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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