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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc780f6b32885d757747d9677c2b61ad1036a004a670211149e0929a5748b97c' 
  AND token = 'Fs52srih2z14el0HLB4ibUI/X+9M/QQRVb+NWGpFI6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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