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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90b77299d1b08b98606261c7abc7f941d08fb0c3e23f12ac63c835cb88ce969d' 
  AND token = 'c52RidewHzNZUvoawiWtiDjd7MTj5AyZhOdMkP2kAsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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