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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d2b2192edf2c155c40aa78d70dfe6a92dc55ebaa16f2420ccece841b3b9afa3' 
  AND token = 'uNeRqGlrJwdQEeh6A97qWQ5WBwQ+4TOK7xVLils19rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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