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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beca3007ee6823d2eddabecdba209a072e4959e614640c9d192d9883f6651601' 
  AND token = 'JWctIAwl5+qAibh/OgeksYAWbAmnhp5HyfwYft4Yj6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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