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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94efb68dcc6800afdb6ebe97bf348a147b498fb6e8dd8f3e805204c25672bcde' 
  AND token = 'p3FJMXPu1Lfm3QGQ2GWY4AsCO6GO8C3Cfbi/KFvfNy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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