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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55edf4e8a44e0bad310cfb2d1a8feaf05754e6ddde24b8901c743a0d697d98bc' 
  AND token = '9WVcWdNr6Usk151fSnZbVwNQwkEDihijX0V35FfGG8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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