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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb08b6f56334d41362e178f20455f6299bc97bd1f6cb2102c3cce9a359aa0e79' 
  AND token = 'YVDbM8kjiMq93EDyniGUxAdrEwyKy78Ei/qY9K0TDr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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