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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1703eb973621a7e6b64f20f87e9d80ca10c4b8a83fd02245fead80abaa9a4e86' 
  AND token = 'KhirR+9HF2h1A2QZc5QONSFon/1/eh0+6I/kDbNZpP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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