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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90eac259aa1f9574ffc70a17573566ea82ceb28d60c3cd51430fd71678bd0b20' 
  AND token = 't8zGMR7VQBc4ArB+l4dibrkdCphHLKJvi8Pk+li9dnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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