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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ccbb20a33a207c029e57c3408e3201c656526b98784cd9b70dd3ec42fd734eb' 
  AND token = 'WQc3P3VDxyIF6ZK3Cms6XbvOyj/kUqMMW0vdNV/NZzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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