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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17d2a856a01bce3ea44aac094c2d94f074561091d93d69886d578325c3144199' 
  AND token = 'n2t8Dg36VdGc3s4QPBkLuoei9TlSoBCdtFXwk8kYOfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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