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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74d82f77142ccaf018a58adc5432ebe87471447289f897e6837427df67a1f622' 
  AND token = 'ue87cfDv/h7O0YE8oJOSwPRpgOfhn7U34BPfIAiLCjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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