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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81f33cd118d0ed754409b3b76ffa5f1d19426245ab019e9606279fb437a69373' 
  AND token = 'bB2D0WH3gIRNOa1OlzfOEja73NvV6YQeW4D3HWX+ojM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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