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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd289ac00f255c71afd624004e02bd596610946e4e58ff21e1b7425f98c3664f9' 
  AND token = 'cmWL5FBZvjNKpuo19n8PKNDTLpJieRPLnz7cEJTtdRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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