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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b5ae77fc3801f2fd19625c9b035d3e0a30b7f5496ae00b05bf2ad3972599dff' 
  AND token = 'cTAaftRh1xBFltv/XP5g5I+z5nvpK3BwLQAqB1gf/7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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