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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '488bbcad2a93df866602b6f8dee82e480e64b6c2ab455fdb0573ae86b340e6cd' 
  AND token = 'cMTVVwi1LKugabNMlw04pf+CpRml8g8MFtI9iWv1bnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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