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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b97293cd8e9f2718ebf06ed5544195212eb973cc4b058c0900ef1bca3ea42074' 
  AND token = 'HjAYHLek4t2PbVQOV3toKPvCtzgj2pNtWljDTS+T3l8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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