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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6c1bd90dccec3c3f6ec5b6f300fae09e5bdc44f30e3646ee9c68519dee29662' 
  AND token = 'FENqamDmJMD6n7hneJJN+Ie6mqFSnowALySJy/4HBIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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