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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f3d5d84584a4b0ee756d2e293ab5858c26e234cd6c68be6f7debcb453997143' 
  AND token = 'vwDF6TzeGjR1l4NxLFLaaGxa93/GNsprd46tiBFX7O0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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