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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f961f9ba4d2fc99aa23067fe904a0b1ab65b32f039c70dbfda7cb376813624e' 
  AND token = '8g486y2hPdoQ2ezuoTRd9F8bzlq4CSPAcKnze+yeF2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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