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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c63209d3d014d8e630c1f39f773f8bed12470fdb1784fc0227b87075d449494' 
  AND token = 'KeyMg70gcqW0+l8iJgDOekc5WyNY3DN9rycWxOZ4D5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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