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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38c50f4707d4861bb358b580c40b52fc9055be6f9574eccb51a38ca6d51a5bc0' 
  AND token = 'xSj6MRLsBs5NcW+j4mQ3UA08U7fr50O956AzbxI9FKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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