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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89566c74dc56650c9ad39feeae9390268c28a82ed98466f4d411a63a989b0e86' 
  AND token = 'AH+WPHRgogiUjTdRARac0nQdrX3T/dSz1J1i08ffV6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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