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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bac831e4946e12c5d086e0b399003741730a36e8b706093fc94ab8b4d1269df' 
  AND token = 'ZcrnIlQIPytbpCcrFUnb4Gc3/hUW+kFBlVD4lZZZlnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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