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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41cb480b918fb22958af5fee7a88d21a7c810c169cfe5de0ba174d496ca65af6' 
  AND token = 'fap7+6v9/RHwiUYLC/IyEOuJsxsaw4X/TGnGOaY2A4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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