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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a816e8a6e1bc843fcb2a4e84eb3c97b555e0f5448eb4100a553d989d94a4efa' 
  AND token = 'ghhFYaXSlsyROhgqmHADm8icq13tupsHgcL/tF2hqig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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