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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b02d0403ebcd5fe8941fee21887fcca853e8cc1be41e173742f0bf5dcf03080' 
  AND token = 'ShYvRtv/s3mluvOBrgtW/ad4Banz4ZiAqqz//7L1xhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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