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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7aafd7d021b1efc65271424de9363108d051dc53f8552ac3c3ff7d9da2e8672' 
  AND token = 'Tekm994tmx2oFLzt5xrTVStybnZL0JHKpqVBMToZhUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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