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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54037bfff1dcd6f80b10917b055a6ef96badbc96d135cee9a6e5c30a3eeb05e1' 
  AND token = 'nH9M5Di2ZvttffJww73cq1fyci31g1DSNVqvI+PzyEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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