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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9837f279fe303d90f2cc4b0571253ae8f31b16d89e3d79a361ef8ac4eff480e' 
  AND token = 'DWSSl/Dmu1CunoVCfF/VT6tZro/ZPSs4NmNgg88Is9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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