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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53b65306bf759e7f24ca6c172a9dd555b2ef4404bd15081db1c594a272ac6ed6' 
  AND token = '9eeaqlPu7+UJHo5N1H2MzZO3ApYe8HmbVR9I69hnxlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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