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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f46df5b1555c60c33f71f33751095473799d9836be93d228a3fbb33020209e8' 
  AND token = 'zeBPIIkAsjeMgMqi5wW2vMxC4/Pffj2DQtSUyVLmML0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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