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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e7c2f8dc7fbe3b7b6e25ae761b3a857df4982a61ae75ef7f56ec16d826b5614' 
  AND token = 'ZX56Ye0BTXECsMG58ApfxrofLVAMHJskCIFMa5r0t+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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