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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02e6ff5e0f3ac032fd42dd11625295b1a4fc978830486e8bc971240423c6a45c' 
  AND token = 'X9jC5v2lDde1d8Ry5JNvw/mpeaqhNsJKlU5iLA40db8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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