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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7be617a3d199c570d6005bb07d48a5e7c542187aaf2d2ca2d650efeae02a9350' 
  AND token = 'BhctWxHCxMFxFW7frwe1jBNDEwlVT00uXW3h/S9wu2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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