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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '531763fc88c87b0808fa88365b1581fcebda6a8f5a33ae65bc72b5a1caf744fc' 
  AND token = 'w9MmnL5IP0P/02o6cpG5jUN8ClW3d1MQwWOn0019PoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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