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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8fd996b1f7ae72969523752095e5e9351b94ee98506be264781b6a3e54f2de7' 
  AND token = 'nfQG8Ptumz4TpyrPcGCkF4q1Trx0KQclMX/iRHvT+2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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