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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '825f99c01ae1f55afe94386e62c399a13bfc3fc54da73fd54b72d84c809187c8' 
  AND token = '0m1MAFmJZ1Abs/hAiwB3E0e4cPKla/GrSPnx2Uj7Wqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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